Home Jstl Use of tag of JSTL

Use of tag of JSTL
Posted on: August 26, 2008 at 12:00 AM

In this section we will learn how to use tag of Xml tag library of Jstl. This tag is used to perform conditional operations marked by and tags.

Use of <x:choose> tag of JSTL

In this section we will learn how to use <x:choose> tag of Xml tag library of Jstl. This tag is used to perform conditional operations marked by <when> and <otherwise> tags.

<x:when> is used to match given condition in 'select' attribute. If found true execute the statement given in this tag.
<x:otherwise> If found condition false given <x:when> tag, execute tag <x:otherwise>.

Standard Syntax : <%@ taglib prefix="x" uri="http://java.sun.com/jsp/jstl/xml" %>

Attributes of <x:when> Tag
select	Defines xPath expression.

choose_xmlJstlTag.jsp

<%@ taglib prefix="x" uri="http://java.sun.com/jsp/jstl/xml" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<html>
    <head>
        <title>Example x:if tag of JSTL</title>
    </head>
    <body>        
        <c:import var="import" url="employee.xml" />
        <x:parse var="doc" doc="${import}" />
        <table border="1">
            <tr>
            <th>Employee Name</th>
            <th>Promotion </th>
            <x:forEach var="emp" select="$doc/org/company/emp" >
                <tr>
                    <td><x:out select="$emp/name" /> </td>
                    <td>
                        <x:choose>                       
                            <x:when select="$emp/age>23">
                                One month<br>            
                            </x:when>

                            <x:otherwise>                
                                Not eligible<br>         
                            </x:otherwise>               
                        </x:choose>                                 
                    </td>
                </tr>
            </x:forEach>
        </table>
    </body>
</html>

Output :

Download Source Code

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